ASTM B673-21
(Specification)Standard Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Pipe
Standard Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Pipe
ABSTRACT
This specification covers UNS N08925, UNS 8354, and UNS N08926 welded pipes of specific dimensions for general corrosion applications. The pipe shall be made from flat-rolled alloy by an automatic welding process with no addition of filler material. Class 1 and Class 2 material shall be cold worked either in both weld and base metal or in weld metal only, subsequent to welding and before final solution treatment. The tensile strength, yield strength, and elongation requirements shall conform to specified values. The pipes shall be subjected to random flattening, leak, and electric tests.
SCOPE
1.1 This specification covers UNS N08925, UNS N08354, and UNS N089262 welded pipe for general corrosion applications.
1.2 This specification covers pipe sizes in schedules shown in Table 1.
1.3 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are now covered by Specification A312/A312M.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 31-Mar-2021
- Technical Committee
- B02 - Nonferrous Metals and Alloys
- Drafting Committee
- B02.07 - Refined Nickel and Cobalt and Their Alloys
Relations
- Effective Date
- 01-Mar-2024
- Effective Date
- 01-Sep-2016
- Effective Date
- 01-Nov-2015
- Effective Date
- 01-Oct-2015
- Effective Date
- 01-Sep-2015
- Effective Date
- 01-Mar-2015
- Effective Date
- 01-Nov-2014
- Effective Date
- 01-Oct-2014
- Effective Date
- 01-Mar-2014
- Effective Date
- 01-Oct-2013
- Effective Date
- 01-May-2013
- Effective Date
- 01-Apr-2013
- Effective Date
- 01-Feb-2013
- Effective Date
- 01-Sep-2012
- Effective Date
- 01-Apr-2012
Overview
ASTM B673-21 is the standard specification established by ASTM International for welded pipe made from nickel-iron-chromium-molybdenum and iron-nickel-chromium-molybdenum-copper alloys. Specifically, it covers welded pipes using UNS N08925, UNS N08354, and UNS N08926 alloys. These pipes are produced from flat-rolled alloys using an automatic welding process without the addition of filler metal. The standard targets general corrosion-resistant applications, providing detailed requirements for mechanical properties, chemical composition, heat treatment, and testing methodologies to ensure quality and performance.
Key Topics
Material Specification:
ASTM B673-21 details the required chemical composition for the specified UNS alloys, ensuring corrosion resistance and mechanical integrity.Manufacturing Process:
Pipes must be made from flat-rolled alloy and welded automatically, with no filler material added. Depending on classification (Class 1 or Class 2), post-weld cold working is required either in both weld/base metals or in weld metal only before final heat treatment.Classes of Pipe:
- Class 1: Welded, cold worked (both weld and base metal), solution treated, and nondestructively tested.
- Class 2: Welded, cold worked (weld metal only), solution treated, and nondestructively tested.
- Class 3: As welded, solution treated, and nondestructively tested.
Mechanical Properties:
Pipes must meet specified minimum values for tensile strength, yield strength, and elongation.Test Requirements:
- Flattening test
- Leak tests (hydrostatic or pneumatic)
- Nondestructive electric tests (eddy-current or ultrasonic)
Each lot of pipes must be tested to verify conformity.
Size and Tolerances:
The standard provides dimensions and nominal wall thicknesses for multiple schedules as referenced in ANSI tables, ensuring compatibility with existing piping systems.Ordering Information:
Purchasers must specify alloy, class, quantity, pipe size, length, required certification, inspections, end finish, and whether samples for product analysis are needed.
Applications
ASTM B673-21 welded pipe is selected for its robust corrosion resistance and high mechanical strength, making it suitable for demanding environments, including:
- Chemical processing plants – handling corrosive fluids and gases
- Petrochemical industries – for pipelines exposed to aggressive media
- Power generation – used in high-temperature, corrosive applications
- Marine engineering – where seawater resistance is critical
- Pharmaceutical and food processing – ensuring purity and durability
The flexibility in available sizes and wall thicknesses allows designers and engineers to specify ASTM B673-21 pipes for both new system installations and the upgrade or replacement of existing piping infrastructure.
Related Standards
When selecting welded pipe for corrosion-resistant applications, ASTM B673-21 is complemented by several related standards, including:
- ASTM A312/A312M – For austenitic stainless steel welded and seamless pipes (including grades formerly covered in B673, such as UNS N08904)
- ASTM B775 – General requirements for nickel and nickel alloy welded pipes, providing broader requirements referenced by B673-21
- ASTM E527 – Standard practice for numbering metals and alloys in the Unified Numbering System (UNS)
- ANSI Standards
- B2.1 Pipe Threads
- B36.19 Stainless Steel Pipe
- B36.10 Welded and Seamless Wrought Steel Pipe
- B31.10 Power Piping
Practical Value
By adhering to ASTM B673-21, manufacturers and end users benefit from:
- Consistent quality from strict chemical and mechanical property requirements
- Traceability through clear ordering and documentation protocols
- Interoperability with existing piping systems via standardized dimensions
- Safety and reliability through comprehensive testing and classification
- Global acceptance as an internationally harmonized standard
ASTM B673-21 delivers a reliable framework for specifying corrosion-resistant nickel alloy welded pipe in critical industry sectors, ensuring performance, safety, and compliance with international best practices.
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Frequently Asked Questions
ASTM B673-21 is a technical specification published by ASTM International. Its full title is "Standard Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Pipe". This standard covers: ABSTRACT This specification covers UNS N08925, UNS 8354, and UNS N08926 welded pipes of specific dimensions for general corrosion applications. The pipe shall be made from flat-rolled alloy by an automatic welding process with no addition of filler material. Class 1 and Class 2 material shall be cold worked either in both weld and base metal or in weld metal only, subsequent to welding and before final solution treatment. The tensile strength, yield strength, and elongation requirements shall conform to specified values. The pipes shall be subjected to random flattening, leak, and electric tests. SCOPE 1.1 This specification covers UNS N08925, UNS N08354, and UNS N089262 welded pipe for general corrosion applications. 1.2 This specification covers pipe sizes in schedules shown in Table 1. 1.3 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are now covered by Specification A312/A312M. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ABSTRACT This specification covers UNS N08925, UNS 8354, and UNS N08926 welded pipes of specific dimensions for general corrosion applications. The pipe shall be made from flat-rolled alloy by an automatic welding process with no addition of filler material. Class 1 and Class 2 material shall be cold worked either in both weld and base metal or in weld metal only, subsequent to welding and before final solution treatment. The tensile strength, yield strength, and elongation requirements shall conform to specified values. The pipes shall be subjected to random flattening, leak, and electric tests. SCOPE 1.1 This specification covers UNS N08925, UNS N08354, and UNS N089262 welded pipe for general corrosion applications. 1.2 This specification covers pipe sizes in schedules shown in Table 1. 1.3 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are now covered by Specification A312/A312M. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM B673-21 is classified under the following ICS (International Classification for Standards) categories: 77.150.40 - Nickel and chromium products. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM B673-21 has the following relationships with other standards: It is inter standard links to ASTM A312/A312M-24, ASTM A312/A312M-16a, ASTM A312/A312M-15b, ASTM B775-15, ASTM A312/A312M-15a, ASTM A312/A312M-15, ASTM A312/A312M-14b, ASTM A312/A312M-14a, ASTM A312/A312M-14, ASTM A312/A312M-13b, ASTM A312/A312M-13a, ASTM A312/A312M-13, ASTM B775-13, ASTM A312/A312M-12a, ASTM A312/A312M-12. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM B673-21 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B673 −21
Standard Specification for
Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-
Chromium-Molybdenum-Copper Welded Pipe
This standard is issued under the fixed designation B673; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2.1 ASTM Standards:
1.1 This specification covers UNS N08925, UNS N08354,
A312/A312M Specification for Seamless, Welded, and
and UNS N08926 welded pipe for general corrosion applica-
Heavily Cold Worked Austenitic Stainless Steel Pipes
tions.
B775 Specification for General Requirements for Nickel and
1.2 This specification covers pipe sizes in schedules shown
Nickel Alloy Welded Pipe
in Table 1.
E527 Practice for Numbering Metals and Alloys in the
1.3 ASTM International has adopted definitions whereby
Unified Numbering System (UNS)
some grades, such as UNS N08904, previously in this speci-
2.2 ANSI Standards:
fication were recognized as stainless steels, because those
B2.1 Pipe Threads
grades have iron as the largest element by mass percent. Such
B31.10 Power Piping
grades are under the oversight of ASTM Committee A01 and
B36.10 Welded and Seamless Wrought Steel Pipe
itssubcommittees.TheproductsofN08904previouslycovered
B36.19 Stainless Steel Pipe
in this specification are now covered by Specification A312/
3. Classification
A312M.
3.1 Class 1—Welded, cold worked, solution treated, and
1.4 The values stated in inch-pound units are to be regarded
nondestructively tested in accordance with 8.3.1.
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3.2 Class 2—Welded, cold worked, solution treated, and
and are not considered standard.
nondestructively tested in accordance with 8.3.2.
1.5 This standard does not purport to address all of the
3.3 Class 3—As welded, solution treated, and nondestruc-
safety concerns, if any, associated with its use. It is the
tively tested in accordance with 8.3.1.
responsibility of the user of this standard to become familiar
with all hazards including those identified in the appropriate 4. General Requirement
Safety Data Sheet (SDS) for this product/material as provided
4.1 Material furnished under this specification shall con-
by the manufacturer, to establish appropriate safety, health,
form to the applicable requirements of Specification B775
and environmental practices, and determine the applicability
unless otherwise provided herein.
of regulatory limitations prior to use.
1.6 This international standard was developed in accor- 5. Ordering Information
dance with internationally recognized principles on standard-
5.1 Orders for material under this specification should
ization established in the Decision on Principles for the
include the following information:
Development of International Standards, Guides and Recom-
5.1.1 Alloy name or UNS number,
mendations issued by the World Trade Organization Technical
5.1.2 Class,
Barriers to Trade (TBT) Committee.
5.1.3 Quantity (feet or number of lengths),
5.1.4 Size (nominal size or outside diameter and schedule
number or average wall thickness),
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2021. Published April 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1980. Last previous edition approved in 2016 as B673 – 05 (2016). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/B0673-21. the ASTM website.
2 4
New designation established in accordance with ASTM E527 and SAE J1086, Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Practice for Numbering Metals and Alloys (UNS). 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B673−21
TABLE 1 Dimensions of Welded Pipe
NOTE 1—The following table is a partial reprint of Table 1 of ANSI B36.19.
NOTE 2—The decimal thicknesses listed for the respective pipe sizes represent their nominal wall dimensions.
NOTE 3—1 in. = 25.4 mm.
Nominal Wall Thickness
Nominal
Outside Diameter
A A
Pipe Size, Schedule Schedule Schedule 40S Schedule 80S Schedule 160S
5S 10S
in. in. mm in. mm in. mm in. mm in. mm in. mm
⁄8 0.405 10.29 . . 0.049 1.25 0.068 1.73 0.095 2.41 . .
⁄4 0.540 13.72 . . 0.065 1.65 0.088 2.24 0.119 3.02 . .
⁄8 0.675 17.15 . . 0.065 1.65 0.091 2.31 0.126 3.20 . .
⁄2 0.840 21.34 0.065 1.65 0.083 2.11 0.109 2.77 0.147 3.73 0.187 4.75
⁄4 1.050 26.67 0.065 1.65 0.083 2.11 0.113 2.87 0.154 3.91 0.218 5.54
1 1.315 33.40 0.065 1.65 0.109 2.77 0.133 3.38 0.179 4.46 0.250 6.35
1 ⁄4 1.660 42.16 0.065 1.65 0.109 2.77 0.140 3.56 0.191 4.85 0.250 6.35
1 ⁄2 1.900 48.26 0.065 1.65 0.109 2.77 0.145 3.68 0.200 5.08 0.281 7.14
2 2.375 60.33 0.065 1.65 0.109 2.77 0.154 3.91 0.218 5.54 0.343 8.71
2 ⁄2 2.875 73.03 0.083 2.11 0.120 3.05 0.203 5.16 0.276 7.01 0.375 9.52
3 3.500 88.90 0.083 2.11 0.120 3.05 0.216 5.49 0.300 7.62 0.438 11.12
3 ⁄2 4.000 101.60 0.083 2.11 0.120 3.05 0.226 5.74 0.318 8.08 . .
4 4.500 114.30 0.083 2.11 0.120 3.05 0.237 6.02 0.337 8.56 0.581 13.41
5 5.563 141.30 0.109 2.77 0.134 3.40 0.258 6.55 0.375 9.52 0.625 15.88
6 6.625 168.30 0.109 2.77 0.134 3.40 0.280 7.11 0.432 10.97 0.718 18.24
8 8.625 219.07 0.109 2.77 0.148 3.76 0.322 8
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B673 − 05 (Reapproved 2016) B673 − 21
Standard Specification for
UNS N08925, UNS N08354, and UNS N08926 Nickel-Iron-
Chromium-Molybdenum and Iron-Nickel-Chromium-
Molybdenum-Copper Welded Pipe
This standard is issued under the fixed designation B673; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope Scope*
1.1 This specification covers UNS N08925, UNS N08354, and UNS N08926 welded pipe for general corrosion applications.
1.2 This specification covers pipe sizes in schedules shown in Table 1.
1.3 ASTM International has adopted definitions whereby some grades, such as UNS N08904, previously in this specification were
recognized as stainless steels, because those grades have iron as the largest element by mass percent. Such grades are under the
oversight of ASTM Committee A01 and its subcommittees. The products of N08904 previously covered in this specification are
now covered by Specification A312/A312M.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet
(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety safety, health, and healthenvi-
ronmental practices, and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
A312/A312M Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
B775 Specification for General Requirements for Nickel and Nickel Alloy Welded Pipe
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.07 on Refined
Nickel and Cobalt and Their Alloys.
Current edition approved June 1, 2016April 1, 2021. Published June 2016April 2021. Originally approved in 1980. Last previous edition approved in 20112016 as
ε1
B673 – 05 (2011)(2016). . DOI: 10.1520/B0673-05R16.10.1520/B0673-21.
New designation established in accordance with ASTM E527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS).
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B673 − 21
TABLE 1 Dimensions of Welded Pipe
NOTE 1—The following table is a partial reprint of Table 1 of ANSI B36.19.
NOTE 2—The decimal thicknesses listed for the respective pipe sizes represent their nominal wall dimensions.
NOTE 3—1 in. = 25.4 mm.
Nominal Wall Thickness, in.Thickness
Nominal
Outside Diameter
A A
Pipe Size, Schedule Schedule Schedule 40S Schedule 80S Schedule 160S
5S 10S
in. in. mm in. mm in. mm in. mm in. mm in. mm
⁄8 0.405 10.29 . . 0.049 1.25 0.068 1.73 0.095 2.41 . .
⁄4 0.540 13.72 . . 0.065 1.65 0.088 2.24 0.119 3.02 . .
⁄8 0.675 17.15 . . 0.065 1.65 0.091 2.31 0.126 3.20 . .
⁄2 0.840 21.34 0.065 1.65 0.083 2.11 0.109 2.77 0.147 3.73 0.187 4.75
⁄4 1.050 26.67 0.065 1.65 0.083 2.11 0.113 2.87 0.154 3.91 0.218 5.54
1 1.315 33.40 0.065 1.65 0.109 2.77 0.133 3.38 0.179 4.46 0.250 6.35
1 ⁄4 1.660 42.16 0.065 1.65 0.109 2.77 0.140 3.56 0.191 4.85 0.250 6.35
1 ⁄2 1.900 48.26 0.065 1.65 0.109 2.77 0.145 3.68 0.200 5.08 0.281 7.14
2 2.375 60.33 0.065 1.65 0.109 2.77 0.154 3.91 0.218 5.54 0.343 8.71
2 ⁄2 2.875 73.03 0.083 2.11 0.120 3.05 0.203 5.16 0.276 7.01 0.375 9.52
3 3.500 88.90 0.083 2.11 0.120 3.05 0.216 5.49 0.300 7.62 0.438 11.12
3 ⁄2 4.000 101.60 0.083 2.11 0.120 3.05 0.226 5.74 0.318 8.08 . .
4 4.500 114.30 0.083 2.11 0.120 3.05 0.237 6.02 0.337 8.56 0.581 13.41
5 5.563 141.30 0.109 2.77 0.134 3.40 0.258 6.55 0.375 9.52 0.625 15.88
6 6.625 168.30 0.109 2.77 0.134 3.40 0.280 7.11 0.432 10.97 0.718 18.24
8 8.625 219.07 0.109 2.77 0.148 3.76 0.322 8.18 0.500 12.70 0.906 23.01
B B
10 10.750 273.05 0.134 3.40 0.165 4.19 0.365 9.27 0.500 12.70 1.125 28.58
B B
12 12.75 323.85 0.156 3.96 0.180 4.57 0.375 9.52 0.500 12.70 1.312 33.32
C
14 14.00 355.60 0.156 3.96 0.188 4.78 0.375 9.52 0.500 12.70 . .
C
16 16.00 406.40 0.165 4.19 0.188 4.78 0.375 9.52 0.500 12.70 . .
C
18 18.00 457.20 0.165 4.19 0.188 4.78 0.375 9.52 0.500 12.70 . .
C C
20 20.00 508.00 0.188 4.78 0.218 5.54 0.375 9.52 0.500 12.70 . .
C C
22 22.00 558.80 0.188 4.78 0.218 5.54 0.375 9.52 0.500 12.70 . .
C
24 24.00 609.60 0.218 5.54 0.250 6.35 0.375 9.52 0.500 12.70 . .
C
30 30.00 762.00 0.250 6.35 0.312 7.92 0.375 9.52 0.500 12.70 . .
A
Schedule 5S and 10S wall thicknesses do not permit threading in accordance with ANSI B2.1.
B
These do not conform to ANSI B31.10.
C
These do not conform to ANSI for Welded and Seamless Wrought Steel Pipe (ANSI B36.10).
2.2 ANSI Standards:
B2.1 Pipe Threads
B31.10 Power Piping
...
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